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The US Transportation Collection consists of documents from across all transportation modes with specific focus on research reports from US DOT, state DOTs, and other transportation organizations. Bookmark this collection: https://rosap.ntl.bts.gov/collection_ust or https://doi.org/10.21949/1530857.

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Showing 2381 - 2400 of 35909 results
  • Developing a Consistent Data Driven Methodology to Multimodal Performance Based and Context Sensitive Design
    Developing a Consistent Data Driven Methodology to Multimodal, Performance Based and Context Sensitive Design
    Savolainen, Peter T. ;
    Gates, Timothy J.
    2022-09-30 | PDF
    Transportation agencies have begun to adopt design practices that introduce greater flexibility and promote a more holistic approach to design as opposed to a strict adherence in designing to standards. This allows for explicit consideration of economic, social, and environmental resources as opposed to more traditional design strategies that are l ...
  • Determining Sample Measures of Distracted Driving Distracted Pedestrian Activities and Impacts of Such Behavior on Traffic Operations at Signalized Intersections
    Determining Sample Measures of Distracted Driving, Distracted Pedestrian Activities and Impacts of Such Behavior on Traffic Operations at Signalized Intersections
    Abou-Senna, Hatem ;
    Radwan, Essam
    2022-09-30 | PDF
    Distracted drivers and pedestrians pose one of the most difficult challenges to ensuring a safe and efficient transportation system. Modern communications have delivered greater convenience. However, this has come at the cost of attention spans. Safety has been thoroughly explored in terms of distracted driving and pedestrians. However, impacts on ...
  • Anomaly Detection and String Stability Analysis in Connected Automated Vehicular Platoons
    Anomaly Detection and String Stability Analysis in Connected Automated Vehicular Platoons
    Wang, Yiyang ;
    Zhang, Ruixuan
    2022-09-29 | PDF
    In this study, the authors develop a comprehensive framework to model the impact of cyberattacks on safety, security, and head-to-tail stability of connected and automated vehicular platoons. First, the authors propose a general platoon dynamics model with heterogeneous time delays that may originate from the communication channel and/or vehicle on ...
  • Statistical analysis of DCP data to evaluate resilient modulus of reclaimed stabilized base Multiple locations Vermont
    Statistical analysis of DCP data to evaluate resilient modulus of reclaimed stabilized base. Multiple locations, Vermont
    Wimett, Jacob ;
    Du, Mangtao
    2022-09-28 | PDF
    The purpose of this study is to determine through statistical analysis if the dynamic cone penetrometer (DCP) can be used as a reliable method of quality assurance to evaluate in-situ resilient modulus (MR) of a reclaimed stabilized base (RSB) in full depth reclamation (FDR) projects. DCP data collected by contractors from the RSB layer at the time ...
  • Statistical Analysis of DCP Data to Evaluate Resilient Modulus of Reclaimed Stabilized Base. Multiple Locations, Vermont [Supporting Dataset]
    Wimett, Jacob ;
    Du, Mangtao
    2022-09-28 | ZIP
    The purpose of this study is to determine through statistical analysis if the dynamic cone penetrometer (DCP) can be used as a reliable method of quality assurance to evaluate in-situ resilient modulus (MR) of a reclaimed stabilized base (RSB) in full depth reclamation (FDR) projects. DCP data collected by contractors from the RSB layer at the time ...
    Dataset Supporting Files
  • Development of a Test to Quantify Organic Content in Silica Sand
    Development of a Test to Quantify Organic Content in Silica Sand
    Bastardo, Johann ;
    Morrison, Elise
    2022-09-08 | PDF
    Fine aggregates used for concrete can sometimes contain organic matter that can inhibit the cement hydration reactions and reduce strength. AASHTO T 21 and AASHTO T 71 have been developed as screening tests for fine aggregate organic matter and quality. The objective of this research project is to determine whether a modified Walkley Black test or ...
  • Automated Identification of Traffic Detector Malfunctions
    Automated Identification of Traffic Detector Malfunctions
    Smaglik, Edward J. ;
    Riffle, Katherine
    2022-09-01 | PDF
    There is a need to improve signalized intersection operations through identifying malfunctioning detectors, as recent work has shown that errors in data quality and accuracy may be widespread due to issues with aging equipment and unmet maintenance needs. Accordingly, there is a desire for policies, procedures, and techniques to identify malfunctio ...
  • Assessment of Maintenance Strategies for Biostabilization of Mudslides on Wildfireaffected Slopes
    Assessment of Maintenance Strategies for Bio-stabilization of Mudslides on Wildfire-affected Slopes
    Tomac, Ingrid ;
    Chaves de Rosas, Jonathon
    2022-09-01 | PDF
    Wildfires in California have increased due to climate change, poor forests maintenance, and human factors. Post-wildfire mudflows frequently occur during rain events on burn scars due to loss of vegetation, change of surface morphology, and soil surface hydrophobicity. Spreading Xanthan gum biopolymer on slopes after wildfires may mitigate the risk ...
  • Enhanced Entrained Air Void System Characterization for Durable Highway Concrete
    Enhanced Entrained Air Void System Characterization for Durable Highway Concrete
    Torres, Anthony ;
    Aguayo, Federico
    2022-09-01 | PDF
    The air void system in concrete provides a strong influence on the behavior of cementitious materials in both the fresh and hardened state, especially as it relates to freeze-thaw resistance and deicer scaling. The most common test procedure to characterize the air void system is ASTM C457 – Standard Test method for Microscopical Determination of P ...
  • Mapping Subsurface Conditions for Transportation Applications
    Mapping Subsurface Conditions for Transportation Applications
    Wood, Clinton M. ;
    Barry, Michelle L
    2022-09-01 | PDF
    Geophysical methods including Multichannel Analysis of Surface Waves (MASW) using both Rayleigh and Love waves, P-wave refraction, Horizontal to Vertical Spectral Ratio (HVSR), Capacitively-Coupled Resistivity (CCR), Electrical Resistivity Tomography (ERT), Ground Penetration Radar (GPR), and Electromagnetic Ground Conductivity (EM31) were used for ...
  • The Spatial Dilemma of Sustainable Transportation and Just Affordable Housing Part II LowIncome Housing Tax Credits
    The Spatial Dilemma of Sustainable Transportation and Just Affordable Housing: Part II, Low-Income Housing Tax Credits
    Ong, Paul M. ;
    Pech, Chhandara
    2022-09-01 | PDF
    This study examines the spatial distribution of Low-income Housing Tax Credit (LIHTC) units to understand whether geographic patterns and trends are consistent with climate change and equity goals. The analysis compares the location of LIHTC units in 2012 and net changes from 2012 to 2019 with a number of transportation, environmental, and racial a ...
  • Steel Reinforcement Section Loss Guidance Tables
    Steel Reinforcement Section Loss Guidance Tables
    Shafei, Behrouz ;
    Shi, Weizhuo
    2022-09-01 | PDF
    The strength and durability of reinforced concrete (RC) bridges are adversely affected by the deterioration of their structural members. When investigating bridges in need of maintenance and repair, the deterioration due to the corrosion of steel rebars is commonly found to be a primary source of structural damage and degradation. To ensure the saf ...
  • Retrospective User Survey for a Rural Electric Vehicle Carsharing Pilot in Californias Central Valley
    Retrospective User Survey for a Rural Electric Vehicle Carsharing Pilot in California’s Central Valley
    Harold, Brian ;
    Rodier, Caroline
    2022-09-01 | PDF
    Rural areas in California present unique transportation challenges associated with long travel distances, infrequent transit service, the cost of car ownership, and limited access to app-based rideshare services that are common to more populated urban centers. Researchers at the University of California, Davis, partnered with the eight San Joaquin ...
  • The Spatial Dilemma of Sustainable Transportation and Just Affordable Housing Part I Housing Choice Vouchers
    The Spatial Dilemma of Sustainable Transportation and Just Affordable Housing: Part I, Housing Choice Vouchers
    Ong, Paul M. ;
    Pech, Chhandara
    2022-09-01 | PDF
    This study examines the spatial distribution of tenant-based Housing Choice Voucher (Section 8) units to understand whether geographic patterns and trends are consistent with climate change and equity goals. The analysis compares the location of HCV units in 2012 and net changes from 2012 to 2019 with a number of transportation, environmental, and ...
  • Development of Guidelines for Inspection Repair and Use of Portable Concrete BarriersVolume 1 Technical Report
    Development of Guidelines for Inspection, Repair, and Use of Portable Concrete Barriers—Volume 1: Technical Report
    Dobrovolny, Chiara Silvestri ;
    Bhutani, Shristi
    2022-09-01 | PDF
    Defining the service life of portable concrete barriers (PCBs) is important to reduce the risk of inferior, unsafe barriers being used on Texas roadways. The Manual for Assessing Safety Hardware (MASH) implementation agreement allows state transportation agencies to continue the use of PCBs manufactured on or before December 31, 2019, and successfu ...
  • 3D Image Analysis Using Deep Learning for Size and Shape Characterization of Stockpile Riprap AggregatesPhase 2
    3D Image Analysis Using Deep Learning for Size and Shape Characterization of Stockpile Riprap Aggregates—Phase 2
    Huang, Haohang ;
    Tutumluer, Erol
    2022-09-01 | PDF
    Riprap rock and aggregates are extensively used in structural, transportation, geotechnical, and hydraulic engineering applications. Field determination of morphological properties of aggregates such as size and shape can greatly facilitate the quality assurance/quality control (QA/QC) process for proper aggregate material selection and engineering ...
  • Traffic Safety Facts 2020 Data 2020 State Traffic Data
    Traffic Safety Facts 2020 Data: 2020 State Traffic Data
    United States. Department of Transportation. National Highway Traffic Safety Administration
    2022-09-01 | National Transportation Statistics (NTS) | PDF
    This fact sheet contains information on fatal motor vehicle traffic crashes based on data from the Fatality Analysis Reporting System (FARS). Refer to the end of this publication for more information on FARS.
  • Longterm Performance of HES Class 50AF Concrete with Polypropylene Fibers as FieldCast Connection between Deck BulbT Girders in SH36 Bridge over Bear River
    Long-term Performance of HES Class 50AF Concrete with Polypropylene Fibers as Field-Cast Connection between Deck Bulb-T Girders in SH-36 Bridge over Bear River
    Ebrahimpour, Arya ;
    Mashal, Mustafa
    2022-09-01 | PDF
    Idaho Transportation Department (ITD) has been using High-Early Strength (HES) concrete Class 50AF with Polypropylene fibers in several parts of the bridge in Accelerated Bridge Construction. This material is only slightly more expensive than conventional concrete, but speeds up the construction. ITD is interested in the suitability of HES concrete ...
  • 2022 Summary of Special Pavement Test Sections
    2022 Summary of Special Pavement Test Sections
    Uhlmeyer, Jeff ;
    Russell, Mark
    2022-09-01 | PDF
    WSDOT continued to collect rutting/wear and smoothness information on a number of completed studies. This report summarizes those studies. • Open Graded Friction Courses: OGFC-AR on I-405 was more susceptible to wear than either OGFC-SBS or HMA matching the pattern seen in the I-5 and SR-520 quieter pavement test sections. • Concrete Performance an ...
  • Evaluation of TwoDimensional 2D Hydraulic Models to Improve Scour Predictions and Countermeasures
    Evaluation of Two-Dimensional (2D) Hydraulic Models to Improve Scour Predictions and Countermeasures
    Castro-Bolinaga, Celso ;
    Sayde, Chadi
    2022-09-01 | PDF
    The overall goal of this research project was to examine the capabilities of FO-DTS and 2D hydraulic models for improving the prediction of scour depths at bridge foundations. To accomplish this goal, the following specific objectives were addressed: (1) to develop, test, and deploy scour monitoring devices based on FO-DTS capable of tracking chang ...
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